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several caves in Mexico. Their ecological status is unknown,but none are troglobites.Family RhinocricidaeTwo species of this family were described fromcaves in Yucatan by Chamberlin (1938) and are listedby Nicholas (1962) as troglobites. Rhinocricus motuiensisis known only from Cenote de Sambula, at Motul,and Yucatobolus spukilensis was described fromActun Xpukil. Both are apparently accidentals.Family SpiroboUelidaeReddellobus troglobius CauseyReddellobus troglobius Causey, 1975b:333, 334-336,337,338, fig. 3-5.Type-Iocality.-Grutas de Jonotla, 3700 ft el, 7 kmSW of Cuetzalan, Puebla, Mexico.Distribution.-Known from four caves near Cuetzalan,Puebla. See Fig. 62.Records.-Puebla: Cueva de la Barranca, Grutas deJonotla, Cueva Octimaxal SUI n. 2, and Cueva Xochitl.Discussion.-This remarkable species is a memberof the subfamily Typhlobolellinae, which is representedonly by four or possibly five described species,all of which occur in Mexico. Reddellobus troglobiusMEXICOGUATEMALAr,.. \,.....--/.//Fig. 62.-Distribution of troglobitic millipeds of the families Cambalidae and Spirobolellidae: 1, Cambala speobia; 2, Mexi·cambala inopis; 3, M. blanda; 4, M. russelli; 5, Reddellobus troglobius; 6, M. [lShi; 7, Jarmilka alba.191